The PGP "How'd You Do That?"
Page

Part III: How Do I Sign A Web Page?

Piece of cake. Well, OK, it's not. It's a pain in the left cheek,
if you know what I mean, but not that big a deal.

I'll give you the mechanics of how it's done in six simple(?) steps
- - -- and try to explain the "whys" after we've finished, although if
you're into PGP and HTML at all, you should be able to see why it's
done this way.
STEP 1:Write your HTML.
Check it, and double check it. Run it on your browser to make sure
it's EXACTLY what you want. Remember that after you PGP sign it, you
can't change anything without invalidating the signature. For this,
we're going to use the simplest HTML example I can think of:

<html>
<head>
<title>This Is The Title
</title>
</head>:
<body>
This is the junk that's going on the web page.
</body>
</html>